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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586bab59655ec434ae12e71e0d2785f600373ffdc918c49be999946ebc72959a' 
  AND token = 'iQj84n39tuDZFatlvweqWnGivAb1b5gBl/ia2+6l7pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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