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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ceb818e6a686e68778f45541ae485eef05dba962dfbdf70af46900cb1fa032' 
  AND token = 'DUV44C4H8hjqhb99H5E/nfPr6Surj7lARqUi1F0m2DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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