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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a3a80d605ca48d053e6c17fe3018bd5d3876d034b547415ba2e4bf8a6c00c5' 
  AND token = 'cQDdUtrj71LzB9BFoOEOBQPBbQK9slkLL/4nwHzyu+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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