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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d3e3c61cea4c207b7eb0057db17e754849ac962460f3f692853ef21e5b59bc' 
  AND token = 'KMWtqOd8igi3S17Ul7h/kvVvhoMnpCn9mmP/SMNkIlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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