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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb68955bc3815e7ff9e32b0d821de7a911ff3f017c713d78003b855f01504ad' 
  AND token = 'PfVZY7d7oiOmF1Z+uYr/LPn760RbwaFYNA3lijB24vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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