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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a47d72f96184ac44c81df6da9e535920173afa842d475ceef220e25572568ab' 
  AND token = 'pWjw0rRLpdYeZlD7hZ+fb3mlxKtZeiuBdmmPtM5x8eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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