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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237061fc37ebcdfd750083a0ebacfe0f1a693b3ebc923c33bc5666b68983ef95' 
  AND token = 'MrnGVPDi1+JCYJqsrHM4vGEJEJm2firBLYGHJ4+yhns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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