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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c130f4a4ad98221b9b1b2fa5f1057fa6b2beb6d49a48379222384f4e3b32198e' 
  AND token = 'SkdpOBekOLE5pUXKdcuRIHvFmCBx32eRI7oSkcMey9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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