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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6969ca6af8e5ffc2d65be8ba1fa75abc6f05fcf6518d302d53d21df6b63dde' 
  AND token = '1bhjrERVU7MjHfFwx/2znxMKgoS/LQmvdoxZP26Uc00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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