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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a0fb7e2ddbb6fcda8a5142d2ffc70daa1035323be8a6a16dc9c57808511ad8' 
  AND token = 'Uv0cnK7urW2aTDYB+6pRIfF3HRvu5fW9vvH7jJi51ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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