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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49da966e3ecf30cec3e353e7cfeb5009f44ce73fbdfe8a40dc921f2907bc8c83' 
  AND token = '6Rz2dR7ptkhfRNOdGOp3wFcTFuA+yHaOuySaGPC84fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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