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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1ece07763771f402b6b49fcb93f5c1681499e5ce19cbd825b0fd18d5f951b5' 
  AND token = 'mKATJ7wJWT2qqMW54p1Aw1ReenkdYiwU8iJRPb+b+SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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