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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b5a438772accb4d14b5ae4d7a74a34367aeb5720fa4e9e3a36ecd6c3ea21b4' 
  AND token = '7e7J7R9y5Q/GSU+c0CgCSVMNw4SWL3H4NLfC/6N/Byg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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