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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45d4f442d9134863cd56e4ec2c59acfd2686f2bba8ed2692426ce9af831776c' 
  AND token = '/kySIxqjOVEbTr1rYKzOJRdHxW/sjcu42bn6Ne2JMF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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