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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfd45257b33b972fe4e31bb06d4c3a3de6a03631ec92bc580293c417b638939' 
  AND token = 'sS9G177PwfVzB0mhdSrSF/ImV//1fCZlPuU7yuuN/YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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