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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3656aab12ffaa266e84464341e758c2d68e69cd6a945771e19def7d617e20066' 
  AND token = 'MT0ufeIPR2JfEce9BocT47Qo77LTVf8xtjKrTTI2LPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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