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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02aefdc6bd32be0406deb66e43ac0f2dd0e14cd1c31253a4c7bfc4711557d05' 
  AND token = 'D4ymMywHuRQUkpyZho7eWgqX2SxehIvSPZGA5yjCxRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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