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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9812564563d58bfa65a7952d11b88043f7859c8c3ec8e18c296c2b058aa97218' 
  AND token = 't5mu/OPXuhIzck5/cVboNszs4c7re6YRwZqBf0usZIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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