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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5e871fbe5bf1838fd6c4f04e4f2e79ab1cc3a5d23ffa10511dd0b0db5292d4' 
  AND token = 'eRIk3t1rPYGHUhjqQavoBIoTv5XKeALXKE6XU9V2Crs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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