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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56d3fa190999490e45580cd055633be8983ce6194e0da557c0575417dea3f36' 
  AND token = 'xtbH74EiBvhCC+YHFG5d5bwX0Gcbm8tBySEDfrS6VCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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