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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac7697d51686dbcf0463bdd8eb0501e1c42ea5db6f735aa88a1e8a81d4af887' 
  AND token = 'IeCIT1tTRVFGJIi7ocHo+LwNK0C6fA6nxN6ovRWtnTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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