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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6144a520af845a4dcc6dbedfcda51b74cc608e2a3b57d0bf98cf9fd2bef284f9' 
  AND token = 'apSE/GQYbjai5qU9v/PEd1+mLBpQHk8qFu0ae9NXA5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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