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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3717bd206e289c89a3efafa4c98dced960ac07b3d49fd38fe50dd83af45ece62' 
  AND token = 'E59GV7IMWTuMeMXi+jecIHDUxPH0AIhFZMSEu3uNT4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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