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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df96da70aa762bca21171b07b9ac0971a9d5ab6886c57906124d7020f7f6454e' 
  AND token = 'LIZVDOouRO1MT3mzPrddz0RjPK/x7jICLLk7Zzn15dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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