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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02aacc9b355874e51c4038b7cccdfa9c896318e887aa3b74d8d61446ed9d8ad7' 
  AND token = 'EIhW3xQllALbVWGI04eBSAC/0GyDgSKrLUpW4GSv4TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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