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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f128a8aa241d96b10e9fc74294e248aa4f0b4785e5547e842d5b8c10284738' 
  AND token = 'fkqLS/8vqppVWkaOrAIC6sU8+OHUksAj2snLzQGf2ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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