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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d27ef6393d907c42c081d146cfd41e158c7a57b675c275322486aa3fade05e0' 
  AND token = 'pZNKXw29sQz253d+1qSOKx9deYS/BMeyeM7r3k70hkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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