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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62549f318ad103c97edc9ccd5d3e88e5adc490714a432e0f1600fef2cb21ec1' 
  AND token = 'q5ggzAxC5/TCn57YTq7baSkRDloJ4uRIO9adUhTvdxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}