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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d10a2dc12f5514d1eee6d9bbdbe87fadea5632b602c010e68fe18c52de073e' 
  AND token = 'Vg/9ZV/+eniJsufXACnexcui/xLvZ+umSq1MgRLg1Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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