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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0722a67f7bde12c26c60bc1f352dd5b58e0570a36bc112d4e6d42f97e0c3146b' 
  AND token = 'c/BYfSNQf4MWEXVXCXf1JtKN3nbBSu4hsI97w2bD3Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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