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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1363ec333749ec596596394aa1ded02257a68d5ad32176987d71381f8f7f5d4c' 
  AND token = 'dmNSKEckP5OLGmGGkBXNoHbbq6fjLmWbeAZcrblccvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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