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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3b7f6f025d36bfe60b31881f6b161927a7c7ae37d68c33a7fd11bf5ccdecdf' 
  AND token = 'aIxAqRPyR43/EuKBok+stMbPGsXU55ZSwnKNRQnsoeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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