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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d047f70d475144b6d651abf84d5a7893ba82cca90739da86cdd2827e4cadfec' 
  AND token = 'MUAmeKyXV8uY/KInwuhXNGAiWGXj5aZAxcnw53vpAh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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