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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbd1d313a7074772e551b32de94faa9dd52137377cb0072da9ec4037d0a9c1d' 
  AND token = 'LsP6IgkKX6kyen4H4iafLAdIvNBLk1H13b4XIN9i4IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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