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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf8c423c336b15aa951286ea81fa93ce6e270c76edd1a220ba9800906f24f2b' 
  AND token = 'oqdFSit+265Jh62VSyv0Koq4W6lwAXabPJp9OcYlNOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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