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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a31932a7c0247da3194c5bab570bd77e912241d1f75e3d70d29dac673a32ba3' 
  AND token = '7TBIG80UOuUO0FBPk8v7JP0YeBHLFkFzNNSnXuIVhWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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