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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5b44f5e5abebefb937987c418bb9c1976385830086ef373fb81b57f1be3ef8' 
  AND token = 'Im7n5H+ggJhNGLT+dKHKlnLmHJvLDrJSQ05pIop4Jts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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