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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa604c9f2dc683cd6fa3340debaf6958f0b23a11e411d0228774f713f5d62368' 
  AND token = 'NpXUrK2EOO4x+KNr/nTutgsmS/N7iNUx9y7NjGzwNdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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