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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7646e9287ee83556761f7951f9c092fe9c7c2f71e6128609d87630efa17c301' 
  AND token = '5xC/UmsXPVnrtUe9NDCPPVTF99cz0ALMHLWItryWU48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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