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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea499a2d8d148e043cdf7dd7da7a69f89793ffd6ef091a4c16ed2ff1eaf2088' 
  AND token = '7PIBlasZQCUApNR7SYJeJom6KiiRve1Ty0IWO0ZY6Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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