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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a11cc8e006ae54fdcd1da422ec74ea85ddcc1654942101f2c4e526a946a5ff9' 
  AND token = 'FNQuloBH/PPC5lmzI7AcSsftTQdVQ52t6xAoMST2x1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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