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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c96d03ddf07ecb405f2e72cc5342d7eb158c55b40ff048e06d51c5b38a6e0a' 
  AND token = 'Xa0Z7kIzNGDcZJAPCHspcGKgbbCsXSoB2bRhvEXPk+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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