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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce953d79ed385060aee2181dcf7ebf1b79876cf325994308550a80522a57d15' 
  AND token = 'wEsI6g/i7o7sLLCQwPacfU0HtXKuzA7JTWTMFrAwUYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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