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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c910a0688f712dbd7abf2ce03daac07e35a6b1b611b1d8092def2ddc87460d' 
  AND token = 'mNl7QWu3yXDATvm2A4lqntFrNviiwJDpMZIXEwMWMec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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