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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b183d37ce8d42293b34e1252f8e02a982fa4505f0a02b091d4515d7aebce34dc' 
  AND token = 'GI7oy8xYcAlL3IbL1K/U4PzFjkm3ZsXOstmfhXHU+f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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