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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b452331897944c4fdab67ea767235c9be56eb607e2497a8cdd745d9a5d80812' 
  AND token = 'JktjT6eR6dJDSVyc1G3R9Cu3Z5NTX6oyDPAB3X4U8ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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