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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88427ef9b49a2f78124323a934a5e41c807194a5b7c541980da2a2a8ee28f6a' 
  AND token = 'DNCXRbTaSkYLhoH98d51zhTXyfZ5i6MDeGwoaFDh03s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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