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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ae05e34ea3a6852b50f3abe0ecb45ff846fd806db4c0bbed867459207997d1' 
  AND token = 'rWgKpWIk671SIHkuIH25g/ZeImk3S5+dihIMrBYfMuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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