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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b405f37ec06f12b8886647e91f74aa015681f647feef5d4635e1db95f04ff4a' 
  AND token = 'Wcm7YMrpvoV6W8nqvH9VerYp15KZp/9fyr00qpRKg4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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