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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafe2dc17a675a2749e37cb59a938127499331a7114b24bd5c762bd9534339ca' 
  AND token = 'KIp3QOUxDDtf86kARV10cl5Yy+VdH9vilK5HQG31hHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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