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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94db2467c040e550e1d4e10b2e73d2277197236f16d9f8dee840f530811d227' 
  AND token = 'kVUu+LkW5E81moF4fgYEBnmUxSyPQLYyswLovDClkKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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