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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d917e626ee07cd1effb6fb5d3e8c2dc0cc1227283b5b5d0db9203bd558a244c' 
  AND token = 'MN5r6UsYDIgcTmfq2gJAAgWFdDsL8MY9CT/mP7jikH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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