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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1a1e69302453b71ae810bcb71328aea7922873da43af0cd227e58cc8219878' 
  AND token = 'LNFLEaTP4mAiSS7fFQ1qE0mDylARrTrRI+I9WOyq1w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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