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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2f5d1f37ca7bb3c579966a5ae725c9171371fc55bd91c7f75b96578dd83fd3' 
  AND token = 'l2vKtDPpLlsz62JMDJLkp5q3ZOVoxvSmHtAtsfIqFXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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