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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f0ea9145427151574b7430d12adadede00058470e214963bb968e4cd5b1ea5' 
  AND token = 'tfAMktLOGekgKs9vo3F9qcLrJrxXz5B6d/MpzVW4X1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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